Don't always show your love in front of your best friend. Don't always show off your boyfriend. Once she starts thinking about your boyfriend, you are not far from tragedy. No matter how conscientious your best friend is, she can't stand you gossiping and showing off your boyfriend for thousands of times, and you may still be kept in the dark when she seduces your boyfriend.
Don't travel with three people on a date. If you create too many opportunities for them to be together, they may turn you into an audience more easily. Don't leave them alone. Well, as long as you are not stupid, don't let your boyfriend be someone else's free labor forever.
I will not always turn the topic to my boyfriend in front of my best friend, nor will I show my love from time to time. When it comes to the other half, I will downplay it and turn the topic to other topics of interest. Your best friend is your playmate and the person in your life circle. There's no need to involve your boyfriend.